You can make a basic minor title in a really easy way. Add a .txt file to your mod's /common/minor_titles/ folder. As long as it does not have the same name as the files in the base game's /common/minor_titles/ folder it will add to the list of minor titles.

You want the minor title to be named and described properly in the game, so we need to add some localisation. So create a new file in the /localisation/ folder of your mod. It must be a CSV file, so the name could be something like 00_Minor_titles.csv.

#CODE;ENGLISH;FRENCH;GERMAN;;SPANISH;;;;;;;;;x
title_houndmaster;Houndmaster;;;;;;;;;;;;;x
title_houndmaster_desc;An honorary title granted to the finest master of canines in the land.;;;;;;;;;;;;;x

Note that the code for the description is simply the code for the minor title with _desc at the end.